Hyperthermophilic (65℃) anaerobic digestion of sewage sludge: Methane generation and VFAs conversion
In this study,seven biochemical methane potential (BMP) experiments (R1 to R7) with feedstocks of different manure and sewage sludge ratio were conducted to evaluate the feasibility of mono hyperthermophilic (65℃) digestion of sewage sludge.Thermophilic sludge digestate was firstly selected as inoculum,and the contribution of cattle manure dosage to digester start-up performance was investigated.The process performance and microbial population dynamics were compared and analysed among the experimental digesters as well.The results witnessed the feasibility of the start-up ofheperthermophilic digester,and the dosage of cattle manure greatly affected system performance.Maximum methane production and lowest VFAs accumulation was observed in digester fed with 100% cattle manure (R1).The methane content in biogas increased to 60~80% under hyperthermophilic condition,much higher than that in conventional mesophilic and thermophilic digesters.The microbial population results showed that Methanothermobacter,a typical hydrogenotrophic methanogens,dominated in all the anaerobic digesters.Furthermore,thermophilic hydrolytic bacteria such as Ruminiclostridium,Coprothermobacter and Caldicoprobacter were detected as main functional bacterial populations under hyperthermophilic condition.Therefore,during the start-up of a hyperthermophilic digester,a higher cattle manure dosage would be necessary to reach a good balance of hydrolysis and methanogenesis in the systems.
Hyperthermophilic anaerobic digestion Start-up strategy Microbial analysis
Chun-xiao Yu Ning Li Bin Dong Xiao-hu Dai
School of Environmental Science and Engineering, Tongji University, No.1239, Siping Road, Yangpu District, Shanghai, China
国际会议
The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)
北京
英文
609-617
2017-10-17（万方平台首次上网日期，不代表论文的发表时间）